If they are factory built wheels and you are the original owner you may have some recourse, but best to take
them to the LBS that sold them for best access to the manufacturer. The Rolf rear on our Macchiato had similar
cracks at about 1yr after bike purchase and it was replaced by Rolf despite the 1 yr warranty. A friend had a
rear wheel drive hub ratchet tooth break off (pawls and free hub were ok) on a Zipp >3yrs old and it was replaced
under warranty.
Last edited by sch; 04-15-19 at 11:33 AM.